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A spatial downscaling method for multielement meteorological data: case study from a water conservation area of the upper Yellow River basin

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Abstract

Meteorological datasets with high-precision and high spatiotemporal resolution are an important base in many applications, such as climatology, ecology, and hydrology. To improve the spatial resolution and accuracy of meteorological data with different elements, this study proposes a method, whereby a machine learning (ML) algorithm is jointly applied to spatial downscaling and post-downscaling error correction (ML–ML). Taking a water conservation area of the upper Yellow River basin (UYRB) as a case study, and using the China Meteorological Forcing Dataset (CMFD), four ML algorithms (Gaussian process regression (GPR), neural network (NN), random forest (RF), and support vector machine (SVM)) were selected to verify the effectiveness of ML–ML and explore the optimal downscaling model suitable for different meteorological elements. The experimental results show the following: (1) the CMFD has good applicability in the UYRB; (2) in addition to the RF, the GRP, NN, and SVM models can successfully retain the original spatial distribution patterns of the CMFD dataset and reflect increased spatial detail; and (3) by comparing the performance of the four models in spatial downscaling and error correction of different meteorological elements, we find that the GPR model is best for precipitation, and the SVM model is best for relative humidity, 2-m air temperature, and 10-m wind speed. On the basis of the thinking behind the ML–ML method, the downscaling models applicable to different meteorological elements screened in this study can provide a reference for generating high-precision and high-resolution meteorological datasets.

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Data availability

The datasets generated during the current study are available from the corresponding author on reasonable request.

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Code availability

The codes are available from the corresponding author on reasonable request.

Funding

This work was supported by the National Natural Science Foundation of China, grant number 42171274.

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Contributions

Ying Cao, methodology, validation, software, writing—original draft, and writing—review and editing. Biao Zeng, conceptualization, resources, supervision, and writing—review and editing. Fuguang Zhang, resources, investigation, and writing—review and editing. Yanqi Shen, resources, validation, and writing—review and editing. Zhenhua Meng, investigation and writing—review and editing. Yong Jiang, investigation and writing—review and editing. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Biao Zeng.

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Cao, Y., Zeng, B., Zhang, F. et al. A spatial downscaling method for multielement meteorological data: case study from a water conservation area of the upper Yellow River basin. Theor Appl Climatol 153, 853–871 (2023). https://doi.org/10.1007/s00704-023-04505-1

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  • DOI: https://doi.org/10.1007/s00704-023-04505-1

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